I beat the game, but loading my old game don't show me any option to change the skin. Is it really necessary to have de skins DLC to see this option ?
–
MachadoNov 10 '11 at 13:09

1

You'll need to download at least one skin DLC to see that option. If you got the Catwoman DLC and you start any of her completed chapters, you'll see the option to change her skin as well
–
JohnoBoyNov 10 '11 at 14:30

You need to have the skin's DLC first of all (it doesn't come with the game by default). If you don't have that yet, the cheapest/easiest way you can get one is through Nos's rewards program (google it). If you can't find any Nos near you, you could also buy one on eBay for a few bucks.

You can't buy the Batman Beyond outfit anymore on its own, you either have to buy a complete skins pack or The Arkham Bundle (which also has Nightwing and Robin [Robin has his own skins!] and all of the other skins) However if you want a free skin, the Batman Inc. Batsuit is available for free.